I have the following object C code for receiving PubNub message.
- (void)client:(PubNub *)client didReceiveMessage:(PNMessageResult *)message {
NSLog(#"Received message: %# on channel %# at %#", message.data.message,
message.data.subscribedChannel, message.data.timetoken);
}
The returned data is
Received message: (
{
key = userName;
value = Enoch;
},
{
key = photoID;
value = 3;
},
{
key = userID;
value = 1;
},
{
key = actionType;
value = chat;
},
{
key = message;
value = H;
}
) on channel chat at 14888810882049989
I would like to parse the message to a dictionary object for accessing the "value" by using the "key"
I am very new in objective C programming and don't know how to do.
Please help.
Loop through the message array and set the key value in dictionary.
NSArray *array = (NSArray*)message.data.message;
NSMutableDictionary *dic = [[NSMutableDictionary alloc] init];
for (NSDictionary *item in array) {
[dic setObject:[item objectForKey:#"value"] forKey:[item objectForKey:#"key"]];
}
NSLog(#"%#", dic);
Or
NSArray *array = (NSArray*)message.data.message;
NSArray *values = [array valueForKey: #"value"];
NSArray *keys = [array valueForKey: #"key"];
NSDictionary *dic = [[NSDictionary alloc] initWithObjects:values forKeys:keys];
NSLog(#"%#", dic);
You can use below method for parsing your data and convert it into dictionary
ChatterBoxMessage *chatterBoxMessage = [[ChatterBoxMessage alloc] initFromDictionary: message.data.message withTimeToken: message.data.timetoken];
[chatterBoxMessage asDictionary];
By This method you will get dictionary.
Above ChatterBoxMessage is a PubNub library class.
Also you can parse your data like below :
for (NSDictionary *objectData in message.data.message) {
NSLog(#"Value : %#",objectData[#"value"]);
NSLog(#"Key : %#",objectData[#"key"]);
}
Related
this is my json content.
[
{
"sha":"30eae8a47d0203ac81699d8fc2ab2632de2d0bba",
"commit":{
"author":{
"name":"Madhura Bhave",
"email":"mbhave#pivotal.io",
"date":"2017-03-23T23:14:32Z"
},
"committer":{
"name":"Madhura Bhave",
"email":"mbhave#pivotal.io",
"date":"2017-03-23T23:14:32Z"
},
"message":"Merge branch '1.5.x'",
}
}
]
and this is my main.i just want to retrieve key value from message and name,email,date from committer dictionary.i got stuck how to do that.
NSMutableArray *CommitArray = [[NSMutableArray alloc] init];
for (NSDictionary *CommitDictionary in CommitJson) {
CommitDict *commitDictObj = [[CommitDict alloc] init];
commitDictObj.message = [CommitDictionary objectForKey:#"message"];
for (NSDictionary *CommitterDictionary in [CommitDictionary objectForKey:#"committer"]) {
Committer *author = [[Committer alloc] init];
author.name = [CommitterDictionary objectForKey:#"name"];
author.email = [CommitterDictionary objectForKey:#"email"];
author.date = [CommitterDictionary objectForKey:#"date"];
}
[CommitArray addObject:commitDictObj];
}
for (int i =0 ; i < [CommitArray count] ; i++){
CommitDict *commitDictObj = [CommitArray objectAtIndex:i];
NSLog(#"Commit Message: %#", commitDictObj.message);
}
return 0;
}
}
i try fetch the json and display it value of message,name,email and date.how can i log the value of message, name, email and date?
Your array contains a dictionary, and that dictionary contains the commit dictionary, not the commit dictionary directly. Replace that part of your code:
for (NSDictionary *CommitDictionary in CommitJson) {
CommitDict *commitDictObj = [[CommitDict alloc] init];
With that:
for (NSDictionary *shaCommitDictionary in CommitJson) {
CommitDict *commitDictObj = [[CommitDict alloc] init];
NSDictionary *CommitDictionary = [shaCommitDictionary objectForKey:#"commit"];
(1) Convert JSON to NSDictionary
NSData *jsonData= ... // Assume you got the data already loaded
NSError *error = nil;
NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
(2) Access the dictionary values (fast enumeration available by now!!
NSString *message = dictionary[#"message"];
NSDictionary *author = dictionary[#"author"];
NSString *name = author[#"author"];
NSString *email = author[#"author"];
NSString *date = author[#"author"];
// OR:
// NSString *name = dictionary[#"author"][#"author"];
// NSString *email = dictionary[#"author"][#"author"];
// NSString *date = dictionary[#"author"][#"author"];
And thats it. I think the tricky thing is to get the JSON Data to the NSDictionary?
See here: https://stackoverflow.com/a/30561781/464016
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
for (NSDictionary* tmp in myDict) {
NSLog(#"%#",tmp);
}
resut:
my tmpis NSString
I want to get a dictionary with key= one , value = 1
for in for NSDictionary will iterate the keys.
for (NSString * key in myDict) {
NSLog(#"%#",key);
NSString * value = [myDict objectForKey:key];
}
If you want to get a dictionary. You have to create a dictionary from these values
for (NSString * key in myDict) {
NSLog(#"%#",key);
NSString * value = [myDict objectForKey:key];
NSDictionary * dict = #{key:value};
}
Or you should init like this:
NSArray *arrDict = #[{#{"one":#"1"},#{#"two":#"2"}];
for (NSDictionary* tmp in arrDict) {
NSLog(#"%#",tmp);
}
You can get all keys from your dic then add the key and value to your new dic like this:
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
NSArray *keys = [myDict allKeys];
for (NSString *key in keys) {
NSDictionary *yourDic = #{key: [myDict valueForKey:key]};
NSLog(#"%#", yourDic);
}
You didn't create it that way. If you wanted to have a NSDictionary inside another NSDictionary you should write something like this :
NSDictionary *myDict = #{
#"firstDict" : #{
#"one":#"1"
},
#"secondDict": #{
#"two":#"2"
}
};
Above code will create a NSDictionary with two dictionaries at keys #firstDict and #secondDict.
Also, bear in mind, that because dictionaries are key-value pairs, using a for-in loop, actually loops through the keys in that dictionary. So your code is equivalent to:
for(NSString *key in dict.allKeys) { ... }
I got the solution
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
NSMutableArray *arrayObject = [[NSMutableArray alloc]init];
NSMutableArray *arrayKey = [[NSMutableArray alloc]init];
NSMutableArray *arrayObjectKey = [[NSMutableArray alloc]init];
NSMutableDictionary *dict = [[NSMutableDictionary alloc]init];
for (NSString *stringValue in myDict.allValues)
{
[arrayObject addObject:stringValue];
}
for (NSString *stringKey in myDict.allKeys)
{
[arrayKey addObject:stringKey];
}
for(int i = 0;i<[arrayKey count];i++)
{
dict = [[NSMutableDictionary alloc]initWithObjectsAndKeys:[NSString stringWithFormat:#"%#",[arrayKey objectAtIndex:i]],#"key",nil];
[dict setObject:[NSString stringWithFormat:#"%#",[arrayObject objectAtIndex:i]] forKey:#"value"];
[arrayObjectKey addObject:dict];
}
NSLog(#"The arrayObjectKey is - %#",arrayObjectKey);
The Output is
The arrayObjectKey is -
(
{
key = one;
value = 1;
},
{
key = two;
value = 2;
}
)
Create the dictionary:
NSDictionary *myDict = [NSDictionary dictionaryWithObjectsAndKeys:#"1",#"One",#"2","Two",nil];
Get a value out using:(this example tmp will be 1)
NSString *tmp = [myDict objectForKey:#"One"];
Display the output in console:
NSLog(#"%#",tmp);
To display the whole NSDictionary
NSLog (#"contents of myDict: %#",myDict);
What you are doing is creating a dictionary with key-value pairs. I think what you want to do is have an array with dictionaries.
NSArray *myArray = #[#{#"one":#"1"}, #{#"two":#"2"}];
for (NSDictionary* tmp in myArray) {
NSLog(#"%#",tmp);
}
However I don't see a point in doing this. What you could do is:
NSDictionary *myDict = #{#"one":#"1",#"two":#"2"};
for (NSString* key in [myDict allKeys]) {
NSLog(#"%# = %#", key, myDict[key]);
}
I have a JSON that I converted into NSDictionary and now I want to search and replace some values in it but I have no idea how to to this,
{
"CODE":200,
"APICODERESULT":"USER_INTERESTS",
"MESSAGE":"user interests fetched successfully",
"VALUE":{
"Books":[
{
"key":"7",
"value":"Fiction",
"selected":true
},
{
"key":"8",
"value":"Romantic",
"selected":true
}
],
"Music":[
{
"key":"11",
"value":"Classical",
"selected":false
},
{
"key":"12",
"value":"Jazz",
"selected":false
},
{
"key":"10",
"value":"Pop",
"selected":false
},
{
"key":"13",
"value":"Western",
"selected":false
}
]
}
}
here I have the value for key that I want to search in the dictionary and when I found that key with the value that I have I want to replace the value for selected in the same block.
For example:-
I have value 10 for key then I want to change the value for key selected to true
so the it will look like this
{
"CODE":200,
"APICODERESULT":"USER_INTERESTS",
"MESSAGE":"user interests fetched successfully",
"VALUE":{
"Books":[
{
"key":"7",
"value":"Fiction",
"selected":true
},
{
"key":"8",
"value":"Romantic",
"selected":true
}
],
"Music":[
{
"key":"11",
"value":"Classical",
"selected":false
},
{
"key":"12",
"value":"Jazz",
"selected":false
},
{
"key":"10",
"value":"Pop",
"selected":true
},
{
"key":"13",
"value":"Western",
"selected":false
}
]
}
}
Consider your input dictionary as mainDictionary and use following code:
NSMutableDictionary *valuesDic = [mainDictionary objectForKey:#"VALUES"];
NSArray *allPossibleKeysArray = [valuesDic allKeys];
for (int j=0; j<allPossibleKeysArray.count; j++) {
NSString *keyStr = [allPossibleKeysArray objectAtIndex:j];
NSArray *array = [valuesDic objectForKey:keyStr];
for (int i=0; i<array.count; i++) {
NSMutableDictionary *dictionary = [array objectAtIndex:i];
NSString *keyString = [NSString stringWithFormat:#"%#",[dictionary objectForKey:#"key"]];
if([keyString isEqualToString:keyvalue]){
[dictionary removeObjectForKey:#"selected"];
[dictionary setObject:[NSNumber numberWithBool:true] forKey:#"selected"];
}
}
}
Hope this helps!!
You should make such changes during parsing the JSON/moving it into model. The code below is a workaround:
NSDictionary *initialJson = //Your JSON here
NSArray *allSubKeys= [initialJson[#"Value"] allKeys];
// Your mutable output.
NSMutableDictionary *mutableJson = [initialJson mutableCopy]
for(NSString *key in allSubKeys) {//Music && Books
// Create another cointainer here
for(NSArray *arr in mutableJson[#"Value][key]) {
// Create another cointainer here
for(NSDictionary *dict in arr) {//key, value, selected
for (NSString *key2 in [dict allKeys]) {
if ([key2 isEqualToString:#"selected"] && [dict[#"value"] equals:#10]) {
// Save YES here
}
else {
// Just copy element
}
// Add object to parent container
}
// Add object to parent container
}
// Add object to parent container
}
// Add object to parent container
}
Here is full solution
NSString* str=#"{\"CODE\":200,\"APICODERESULT\":\"USER_INTERESTS\",\"MESSAGE\":\"user interests fetched successfully\",\"value\":{\"Books\":[{\"key\":\"7\",\"value\":\"Fiction\",\"selected\":true},{\"key\":\"8\",\"value\":\"Romantic\",\"selected\":true}],\"Music\":[{\"key\":\"11\",\"value\":\"Classical\",\"selected\":false},{\"key\":\"12\",\"value\":\"Jazz\",\"selected\":false},{\"key\":\"10\",\"value\":\"Pop\",\"selected\":false},{\"key\":\"13\",\"value\":\"Western\",\"selected\":false}]}}";
NSData *data = [str dataUsingEncoding:NSUTF8StringEncoding];
NSMutableDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"dictionary before updating: %#", dictionary);
// copy old dict
NSMutableDictionary* newDict=[[[NSMutableDictionary alloc]init]autorelease];
[newDict addEntriesFromDictionary:dictionary];
// get the entry to be changed
NSMutableDictionary* valueDict=[[[NSMutableDictionary alloc]init]autorelease];
[valueDict addEntriesFromDictionary:newDict[#"value"]];
NSMutableArray* musicArray=[[[NSMutableArray alloc] init] autorelease];
[musicArray addObjectsFromArray:newDict[#"value"][#"Music"]];
// get the music array and change your property
NSMutableDictionary* musicDict2=[[[NSMutableDictionary alloc] init] autorelease];
[musicDict2 addEntriesFromDictionary:[musicArray objectAtIndex:2]];
[musicDict2 setValue:[NSNumber numberWithBool:YES] forKey:#"selected"];
[musicArray replaceObjectAtIndex:2 withObject:musicDict2];
// update the value dictionary
[valueDict setObject:musicArray forKey:#"Music"];
//update the new dictionary
[newDict setObject:valueDict forKey:#"value"];
NSLog(#"dictionary after updating: %#", newDict);
I want to give a key value from my NSDictionary and get the value associated to it.
I have this:
NSArray *plistContent = [NSArray arrayWithContentsOfURL:file];
NSLog(#"array::%#", plistContent);
dict = [plistContent objectAtIndex:indexPath.row];
cell.textLabel.text = [dict objectForKey:#"code"];
with plistContent :
(
{
code = world;
key = hello;
},
{
code = 456;
key = 123;
},
{
code = 1;
key = yes;
}
)
So how do I get "hello" by giving the dictionary "world"?
If I understand your question correctly, you want to locate the dictionary where "code" = "world" in order to get the value for "key".
If you want to keep the data structure as it is, then you will have to perform a sequential search, and one way to do that is simply:
NSString *keyValue = nil;
NSString *searchCode = #"world";
for (NSDictionary *dict in plistContents) {
if ([[dict objectForKey:#"code"] isEqualToString:searchCode]) {
keyValue = [dict objectForKey:#"key"]); // found it!
break;
}
}
However if you do alot of this searching then you are better off re-organizing the data structure so that it's a dictionary of dictionaries, keyed on the "code" value, converting it like this:
NSMutableDictionary *dictOfDicts = [[NSMutableDictionary alloc] init];
for (NSDictionary *dict in plistContents) {
[dictOfDicts setObject:dict
forKey:[dict objectForKey:#"code"]];
}
(note that code will break if one of the dictionaries doesn't contain the "code" entry).
And then look-up is as simple as:
NSDictionary *dict = [dictOfDicts objectForKey:#"world"]);
This will be "dead quick".
- (NSString*) findValueByCode:(NSString*) code inArray:(NSArray*) arr
{
for(NSDictonary* dict in arr)
{
if([[dict valueForKey:#"code"] isEqualToString:code])
{
return [dict valueForKey:#"key"]
}
}
return nil;
}
When check self.weatherData, I get nothing even though there is data in "data". Here is my function:
- (void)handleNetworkResponse:(NSData *)myData
{
//NSMutableDictionary *data = [NSMutableDictionary dictionary];
NSMutableDictionary *data = [[NSMutableDictionary alloc] init];
// now we'll parse our data using NSJSONSerialization
id myJSON = [NSJSONSerialization JSONObjectWithData:myData options:NSJSONReadingMutableContainers error:nil];
// typecast an array and list its contents
NSDictionary *jsonArray = (NSDictionary *)myJSON;
// take a look at all elements in the array
for (id element in jsonArray) {
id key = [element description];
id innerArr = [jsonArray objectForKey:key];
NSDictionary *inner = (NSDictionary *)innerArr;
if ([inner conformsToProtocol:#protocol(NSFastEnumeration)]) {
for(id ele in inner) {
id innerKey = [ele description];
[data setObject:[[inner valueForKey:innerKey] description] forKey:[ele description]];
}
}
else {
[data setObject:[inner description] forKey:[element description]];
}
}
NSLog([data description]);
self.weatherData = data;
}
However when check self.weatherData, I get nothing even though there is data in "data".
Issue was data isn't there when I assign it to the variable from the an asynchronous method :D
all fixed now by adding a delegate call back